Update with the numbered cards included. Still struggling with choosing the colors. Aces still need a lot of work. Court card faces need color... Also still working on backs.
(Click thumbnail to see full size version)

Here's another attempt with coloring. The color of the K,Q,J, and A letters share Red/Black colors while the pips are still 4 colors. I still need to redo the numbered cards with this design but I have the court cards updated so far. Thoughts?

As for the 4 color suits. I'm really on the fence about this one. I really like how they look but I understand a lot of people prefer standard red/black decks. I need to think about what kind of audience I'm trying to make this deck for. Here's super rough mock-up of red/black to see how it could look. What do you guys think?

A new update with some added colors and also some more court card additions/modifications. I'm thinking maybe the gold colored parts could be printed with gold foil ink and the rest would be regular colors. Still a lot of work and refining to do but let me know what you think so far!

So I've been trying out some variations on coloring. I'd like to keep the 4 color suits but also thinking about what @GarryP said about some games needing to pair up traditionally RED and BLACK cards together. So in this example, each suit still has it's own color but the Diamonds and Hearts also share a central banner color while the Club and Spades share a common banner color so if you're playing Solitaire then you'd know the central banner colors would need to be alternating for proper play. The common banner colors here are Yellow and Purple. (Keep in mind the actual colors aren't really finalized. I just quickly chose these to see how it looks roughly. I still need to come up with a proper color pallet.)

Few updates:
I worked on the Pip design. They're a little more geometric and I kinda of like it.
Started adding some color to the court cards.
Arranged all the other pips the way I did the the diamonds to see how they all look.
Few of the court cards and Ace's got updated with some new details.
Still lots to do but I feel like I'm making some progress!

I wonder if the ease of counting the pips is actually important when there's already a number in both corners to tell which card you're holding. Most of the time, Someone is holding their cards in fanned position to read just the corner number. I figure since this is the case I could be more creative with the pip arrangement instead of worrying about ease of counting. If a lot of people disagree I would consider making it more "countable" but I'm not sure I'm convinced to go that route at this point.
Messing around some more with pip arrangements and also a different style diamond:

I kind of figured people wouldn't have to count since they'd default to looking at the number in the corner anyways and that meant the pip arrangement could be more creative rather than functionally quickly countable. Before there were numbers in the corners of the cards that was definitely more important. Just my line of thought as to why I'm trying some different arrangements.
Thanks for the suggestions!

I've been playing around with pip arrangements for the number cards. The last row in the picture is really rough. That one is me trying to experiment with an asymmetrical layout of the pips and also have different sizes. The rest of the rows are variations of cards that probably already exist in some form. Row 4 is essentially the layout a deck of bicycle cards has. Rows 1-3 are just something I quickly came up with when trying to keep the pips symmetrical and on a grid.
I'm leaning towards trying to make the last row style work since the asymmetrical aspect of it would make it easy to tell the top from the bottom of the cards. Being able to tell if the card is "upside down" would help with them being used as a tarot deck and also be fine for regular card games.
Heart, Spades, and Clubs are pretty easy to show upside down but the Diamonds are symmetrical so trying to portray them upside down would need something like the last row in the picture to convey. Or I could change the Diamonds shape to being asymmetrical too but I'm not sure I'd want to do that.
I'll stop ranting now.... Lol.

2. Yeah. I'm gonna think more about this 4 colors before setting it in stone but I'm leaning towards keeping it 4 colors.
3. That's a great point I didn't think about. Thanks!
4. Totally agree. Will consider this when spending time finalizing the text.
5. I'm going to give them all a splash and then decide if I want to try coloring further to see how it looks. Coloring is a whole other thing after the line work so we'll see how that goes.
6. I think you're right about the 4 finger route. I drew up some 4 fingers hands last night and didn't like them. I asked my girlfriend which she preferred and she said the 5 finger looked better so I'm gonna keep the 5 finger hands. You're right that just because it was useful for animation doesn't mean it's useful in all situations. Even some animated shows have 5 fingers and it looks fine.
Really appreciate the feedback!

This is interesting: I read about how animators typically give characters 4 fingers instead of 5 because for some reason 5 fingers on an animated character tends to look weird. I might redo the hands on the court cards to have 4 fingers. The article I read is here and there's also a youtube video you can watch about it in the article.
I actually did have a hard time trying to get 5 fingers to look ok in the current design so maybe 4 will be easier and better looking?

Good point about the the Spades and Hearts. I'm definitely going to add something to the spades to differentiate them better.
Never thought about how this would affect playing some games. I like the idea of 4 colors and actually got the idea from playing online poker back in the day and it was using a no-revoke deck. I'll have to think about this one some more.
Yeah he's flipping the bird. I just thought it was funny and it's subject to change.
The text right now is basically a placeholder. I've been messing with different fonts and such but haven't focused too much time on the letters yet. Will definitely make them larger thought.
Yeah I'm on the fence about how much color I'd like to add. Sometimes I think I'll only use the suit color for the respective court cards and other times I think I should color them in completely. The hearts court cards having red color in them was me testing out that idea.
Thanks so much for the great feedback!